Earth-current results at Tucson Magnetic Observatory, 1932-1942
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<p>Carnegie Institution of Washington publication 175, vol. IX</p><p></p>"Researches of the Department of Terrestrial Magnetism, vol. IX"
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<p>Carnegie Institution of Washington publication 175, vol. IX</p><p></p>"Researches of the Department of Terrestrial Magnetism, vol. IX"
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"<p>Carnegie Institution of Washington publication 175, vol. IX</p><p></p>"Researches of the Department of Terrestrial Magnetism, vol. IX""
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